While there is no mention that Mayor John Cranley is among 406 U.S. climate mayors committed to adopt, honor and uphold the Paris Climate Agreement goals in this rating, Insider reports that in 2012, Cincinnati, which made WalletHub's and NerdWallet's greenest city rankings, became the largest US city to offer its residents 100% renewable electricity. With a park system that comprises more than 5,000 acres, greenery is also abundant.

To see the entire 2018 list of the top 25 most environmentally friendly cities, click here.